Two weeks ago on my 500 ug trip I experienced it with open eyes. It were transparant window patterns seen on the floor, shifting in a controlled motion through the music I was listening to. I could feel sound waves on my skin as it was wind. Remarkable also how sometimes half of the sound of the music I was listening to was going ahead normally, while some other beats or waves remained much longer tangible in my consciousness than the actual presence of those sounds in reality. Visuals were minorly present at this point. Only significant crystal fractals with no colours.
Shrooms (3 to 6 grams) bend the existing environment itself way more powerful with open eyes, and deform size or shape, or make everything in the environment waving completely. But there's less synesthesia and there is much less addition pulled over the environment itself. But powerful CEV's which are very elaborated. Sound comes in as it comes from outer space. Shrooms affect the brains much more severe than LSD, while LSD affects the sensory and decreases it's filters.
Subjectively, synesthesia does not belong to psilo as much as acid. But shrooms produce a greater ego death and identity loss than LSD.
) Especially psychedelic and experimental music that explores static+changing timbres and textures, and how music can affect your perception of time, etc.
